【正文】
earch work. With the methods and means, we can obtain conclusion, sometimes important information with special value. Abstract should be excluded from the disciplines which has bee mon sense content。 we should avoid the application in the introduction of the contents written abstract。 general nor the thesis explains and ments. Abstract should has strict structure, expression concise, exact semantic. We should think about what to write firstly, and what to write secondly according to the logic order. We should emphasize on the coherence between sentences each other. Abstract sh